Improvement in steam-engine throttle-valves



UNITED STATES PATENT Carrer..

HENRY C. BULL AND SAMUEL T. SHELLEY, OF LOUISVILLE, KENTUCKY.

IMPROVEMENT IN STEAM-'ENGINE THROTTLE-VALVES.

Specification forming part of Letters Patent No. 84,992, dated December 15, 1868.

To whom it may concern:

Be it known that we, HENRY G. BULL and SAMUEL T. SHELLEY, both of Louisville, Jefferson county, Kentucky, have invented a new and useful Improvement in Balanced Valves; and we hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification.

Our invention relates to a form of balanced valve in which a piston having free motion within a cylindrical chamber takes the place of one of the disks and accompanying seat of the customary balanced valve, so as to avoid the leakage which arises from the unseating of one or other disk by the expansion or contraction incident to its use; and it consists in a throttle valve constructed in accordance with the above-indicated plan.

Figure 1 is a vertical transverse section of 'our improved valve, showing a section of the pipe for conducting the steam to the engine. Fig. 2 is an elevation of the same.

Corresponding letters refer to corresponding parts in both figures.

A in the drawings represents the disk of a valve, which disk is connected by a stem, C, with a piston, B. This disk is provided upon its lower surface with a series of projections, which serve as guides to the same when it is raised from its sea-t, but which do not obstruct the passage of the steam through the aperture caused by opening the valve.

B is a piston-like structure, placed upon the end of the spindle C which is opposite to the one upon which diskAis placed. This piston is supplied with metallic or other suitable packing, which fits accurately the cylinder D, which is formed in the casing or seat F.

G is the spindle above referred to, which unites the disk A with the piston B. D is a cylindrical chamber, which is formed within the valve-casing F, and is so arranged with reference to the seat of disk A as that, when the piston is moved within its cylinder, the valve or disk will be raised from or lowered into its seat. E is a pipe for carrying the steam which passes the disk as it is raised from its rest to any desired location.

F is the casing of the valve. It is so constructed as to be capable of being attached to a steam pipe or conduit leading from a steamgenerator, and so as to conduct the steam between the disk A and piston B when the valve is closed, as well as when it is open, by which means the valve, or the pressure thereon, is balanced and the valve rendered easy of control.

Gis a lever, which, at its inner end, is secured to projections which are formed upon the casing F, and which is also pivoted to simA ilar projections formed upon the outer face of the piston B, its ofce being, to furnish the means of controlling the piston and disk in their movements.

The operation of our valve is as follows: The valve having been constructed as described, and as shown clearly in Fig. 1 of the drawings, it is to be placed in any desired location. in connection with the pipe or conduit leading from a steam-generator or any other device in which gas is contained, the movements ot' which it is desirable to control when the pipe which is to carry the steam or lother gas or liquid to its destination is to be attached.

When in the above-described position, it

will be seen that the steam will press upon the disk and the piston equally, and that, as a consequence, a balanced valve will be produced, the movements of which may be readily controlled by means of the lever G.

We are aware that a patent was granted to Thomas McDonough on the 12th of February, 1844, in which onefeature of our combination is shown and described-namely, the valve with a piston on the stem thereof. This we do not claim as our invention.

We are also aware that in the English provisional specication of B. Bodmer, No. 1,394, of 1857, and that of Richard Needham and James Nollitt, No. 2,667, of 1863, mention is made of a valve having the above-described feature of our device 5 but as they do not show or describe our combination of such device,

we do not claim anything therein shown.

Having fully described our invention, what we claim, and desire to secure by Letters Patent, is

The combination and arrangement of the casing F, valve A B C, and lever G, substantially as shown and described.

In testimony of which invention we hereunto set our hands.

HENRY C. BULL. SAMUEL T. SHELLEY. Witnesses:

Gno. H. KNIGHT, JAMES H. LAYMAN. 

